Ethyl acetate hexane → HCID 178514971, compound

Participants

Reaction Steps

3-Bromomethyl-5-nitro-indazole-1-carboxylic acid tert-butyl ester (0.63 g, 1.77 mmol) and potassium phthalimide (0.396 g, 1.2 eq) were stirred in DMF (1 mL) at 80° C. for two hours. TLC (20% EtOAc/hexane) showed starting material consumed and new products formed. After DMF was evaporated, a residue, 1.33 g, was obtained. The resulting residue was stirred in DCM and filtered. The filtration cake then washed with DCM followed by hexane. The evaporation of the filtrate gave 0.79 g of crude. Flash chromatograph (20-30% EtOAc/hexane) gave a mixture, two spots shown on TLC. During the sample preparation, solid precipitated and the solid was collected, 95 mg. MS showed de-Boc product, (M+H)+ at 323. An adequate amount of this mixture was treated with TFA in DCM for two hours. TLC showed one spot and MS gave (M+H)+ at 323. The remaining mixture was stirred in a mixture of TFA (6 mL) and DCM (10 mL) for two hours. Evaporation of TFA and DCM gave the desired product, 0.71 g, (quant. yield).

Provenance & Evidence